It's the year 2006.

Gojo and Geto: They're riding a bike but they crash into a tree

Principal Yaga: He comes over and punches their heads as punishment

Mei Mei: She's counting her money

Utahime: She's just watching Gojo and Geto get hit

Nanami and Haibara: They're having a conversation

Shoko: She's leaning against a wall and smoking a cigarette